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Finding the Fourth Proportional to 66.31, 99.47 and 25.71

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Solution

The fourth proportional to 66.31, 99.47 and 25.71 is: 38.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.31 : 99.47 = 25.71 : x
  2. Step 2: Convert to fraction form
    66.31/99.47 = 25.71/x
  3. Step 3: Cross multiply
    66.31x = 99.47 × 25.71
  4. Step 4: Simplify right side
    66.31x = 2,557.25
  5. Step 5: Solve for x
    x = 2,557.25/66.31
  6. Step 6: Final answer
    x = 38.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.